Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hanh le » thanh le, hanh ve, hanh de
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, dang xay, mang cua
va dau » va dao
le cua » ly cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((((mang xa) OR (mang may))) or (nang x)) hoi. lieu va dau tuc van hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((((mang xa) OR (mang may))) OR (nang x)) hoi. lieu va dau tuc van hanh le cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((((mang xa) OR (mang may))) or (nang x)) hoi. lieu va dau tuc van hanh le cua tre*".